| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
In this study, a genome-wide shRNA screen was performed using Shiga toxin (Stx)-induced cell death to search for new factors that are involved in glycolipid metabolism and transport. Several genes essential for the biosynthesis of Gb3, the Shiga-toxin receptor, were concentrated, which included glucosylceramide synthase. Furthermore, many shRNAs were concentrated in this screen. However, most of the Stx-resistant shRNAs showed off-target effects, which included an shRNA targeted for CERS2, one of the ceramide synthases. Then, CERS2 mutants were constructed by genome-editing, and non-resistance to Stx was confirmed in these mutants. On the other hand, sphingolipid biosynthesis was analyzed in these mutants, and the results suggested the existence of a yet-to-be-identified mechanism rendering very-long-chain-ceramides more accessible than C16-ceramide to glucosylceramide synthase, compared with sphingomyelin synthase.
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